If the cockroach you found is large, an inch and a half or more, reddish brown, and you found it in a basement, a garage, or near a floor drain, it is almost certainly an American or Oriental cockroach. If it is small, around half an inch, light brown with two dark stripes running lengthwise behind the head, and you found it in a kitchen or a bathroom, that is a German cockroach and it is a different kind of problem.
People tend to react more strongly to the big one. It is the wrong instinct. The big one is usually an intruder. The small one usually means a population.
American and Oriental cockroaches live outdoors and in wet, dark spaces: sewers, storm drains, crawlspaces, mulch beds, under stone. They come inside through floor drains, sump pits, gaps around pipes, and under exterior doors, and they are most likely to appear after heavy rain drives them out of the ground or in late summer when conditions dry out.
Finding one or two is not evidence of an infestation in your kitchen. It is evidence of a way in and a damp space they like. The fix is largely a moisture and exclusion job, plus a treated band at the foundation to stop them crossing.
German cockroaches are different in almost every way that matters. They do not live outdoors in our climate. They arrive inside something: a grocery bag, a cardboard case, a used appliance, a piece of secondhand furniture. Once inside they stay inside, and they reproduce fast.
A female carries an egg case containing roughly thirty to forty eggs and holds it until just before hatching, which means far more of them survive than in species that deposit the case early. A population can go from a few insects to a serious problem in a couple of months.
They also harbor in places you cannot easily reach: the motor compartment of a refrigerator, under a dishwasher, inside the hollow legs of a table, behind a wall switch plate, in the seam of a cabinet.
An exterior barrier does nothing to a German cockroach population, because the population is not crossing the barrier. It is already inside, in the kitchen, breeding.
What actually works is targeted gel baiting placed directly in harborage, growth regulators that stop the next generation from maturing, equipment breakdown so treatment reaches into appliances and voids, and follow-up visits scheduled on the hatch cycle rather than on your regular service calendar.
There is one thing that will undo all of it: store-bought repellent sprays. They drive roaches away from the bait you want them to eat and scatter them into new areas. If you are working with a professional on German roaches, put the aerosol can away.
German roach work requires cooperation, and any company that pretends otherwise is setting you up to be disappointed. Clearing and cleaning under and behind appliances, emptying the lower cabinets they name, and keeping food and water sources closed off between visits all materially change the outcome.
German cockroaches are covered by your agreement, but not the way everything else is. Because they are not a perimeter pest and are not resolved on a routine stop, reported activity gets handled as a dedicated treatment scheduled separately from your regular visit, with follow-ups until the population is cleared. We give you written preparation instructions before we come.
American and Oriental roaches are handled in the ordinary course of service: exterior band, interior crack-and-crevice where needed, and a conversation about the drain or the damp space that is letting them in.
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